Download A Simple Non-Euclidean Geometry and Its Physical Basis: An by Basil Gordon (auth.), Basil Gordon (eds.) PDF

By Basil Gordon (auth.), Basil Gordon (eds.)

There are many technical and renowned bills, either in Russian and in different languages, of the non-Euclidean geometry of Lobachevsky and Bolyai, some of that are indexed within the Bibliography. This geometry, also referred to as hyperbolic geometry, is a part of the necessary material of many arithmetic departments in universities and lecturers' colleges-a reflec­ tion of the view that familiarity with the weather of hyperbolic geometry is an invaluable a part of the heritage of destiny highschool lecturers. a lot cognizance is paid to hyperbolic geometry via university arithmetic golf equipment. a few mathematicians and educators inquisitive about reform of the highschool curriculum think that the mandatory a part of the curriculum should still contain components of hyperbolic geometry, and that the not obligatory a part of the curriculum may still contain an issue on the topic of hyperbolic geometry. I The extensive curiosity in hyperbolic geometry is no surprise. This curiosity has little to do with mathematical and medical functions of hyperbolic geometry, because the functions (for example, within the conception of automorphic features) are relatively really good, and usually are encountered via only a few of the numerous scholars who carefully research (and then current to examiners) the definition of parallels in hyperbolic geometry and the detailed positive aspects of configurations of traces within the hyperbolic aircraft. The crucial reason behind the curiosity in hyperbolic geometry is the $64000 truth of "non-uniqueness" of geometry; of the life of many geometric systems.

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Additional resources for A Simple Non-Euclidean Geometry and Its Physical Basis: An Elementary Account of Galilean Geometry and the Galilean Principle of Relativity

Example text

25 above);it is only these properties of figures that ~ve geometric significance in this unusual geometry. Also, we shall bear in mind that our geometry arose naturally out of mechanical considerations connected with Galileo's principle of relativity. This implies that, in our case, properties of geometric significance are really properties of mechanical significance; more specifically, facts of one-dimensional kinematics. Before considering the basic concepts of Galilean geometry we shall find it useful to list certain fundamental properties of the motions (I).

Galileo's principle of relativity implies that all properties studied in mechanics are preserved under transformations of the physical system obtained by imparting to it a velocity which is constant in magnitude and direction (such transformations are called Galilean transformations). In other words, mechanical properties of (moving) objects do not change under Galilean transformations (cf. the definition of geometric properties given in Sec. I as properties invariant under motions). The Galilean principle of relativity can be stated in a "geometric" form which links it directly to Klein's concept of geometry.

Decompose the motions (12") into "elementary" motions [in a manner suggested by the decomposition of the motions (12) into the elementary motions (15a-c)]. 6 (a) It is natural to think of the motions (12') as the direct motions of three-dimensional Galilean geometry. How would you define the corresponding opposite motions as well as the corresponding (direct and opposite) similitudes (cf. Exercise 4)? Decompose the motions (12') into simpler ones [in a manner suggested by decomposition of the motions (12) into the elementary motions (15a-c)].

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